Numerical Model for Tracing the Response of FRP-Strengthened RC Beams Exposed to Fire
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
This paper presents the development of a numerical model for evaluating the performance of fiber-reinforced polymer (FRP)-strengthened RC beams under fire conditions. The model is based on a macroscopic finite-element approach and utilizes moment-curvature relationships to trace the response of insulated FRP-strengthened RC beams from linear elastic stage to collapse under any given fire exposure and loading scenarios. In the analysis, high temperature properties of constitutive materials, load and restraint conditions, material and geometric nonlinearity are accounted for, and a realistic failure criterion is applied to evaluate the failure of the beams. The model is validated against fire test data on FRP-strengthened RC beams and is applied to study the effect of FRP-strengthening, insulation scheme, and failure criterion on the fire response of FRP-strengthened RC beams. Results from the analysis indicate that FRP-strengthened RC beams should be protected with supplemental fire insulation to satisfy fire resistance requirements. A case study is presented to illustrate the application of the model for optimizing the fire insulation scheme to achieve required fire resistance in FRP-strengthened concrete beams.
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Acknowledgments
The research presented in this paper is supported by the National Science Foundation (Grant No. NSFCMMI 0855820) and Michigan State University through Strategic Partnership Grant (Award No. UNSPECIFIEDSPG 71-4434). Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 730 - 742
Copyright
© 2010 ASCE.
History
Received: Aug 6, 2009
Accepted: Apr 5, 2010
Published online: Apr 9, 2010
Published in print: Dec 2010
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